If i have a long luteal phase can i test a day or two earlier then 4 days before my missed period?

Just curious bc of course i have all the signs of PMS and pregnancy since it is almost impossible to distinguish.... the wait is killing me. Im not quite sure bec i just got off the pill a couple months ago. But I think I ovulated 9 days ago but my period isnt due for another 6? Can i test earlier ?